'\" t
.TH "SD_BUS_MESSAGE_SEAL" "3" "" "systemd 257.1" "sd_bus_message_seal"
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.SH "NAME"
sd_bus_message_seal \- Prepare a D\-Bus message for transmission
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-bus\&.h>
.fi
.ft
.HP \w'int\ sd_bus_message_seal('u
.BI "int sd_bus_message_seal(sd_bus_message\ *" "m" ", uint64_t\ " "cookie" ", uint64_t\ " "timeout_usec" ");"
.SH "DESCRIPTION"
.PP
\fBsd_bus_message_seal()\fR
finishes the message
\fIm\fR
and prepares it for transmission using
\fBsd_bus_send\fR(3)\&.
\fIcookie\fR
specifies the identifier used to match the message reply to its corresponding request\&.
\fItimeout_usec\fR
specifies the maximum time in microseconds to wait for a reply to arrive\&.
.PP
Note that in most scenarios, it\*(Aqs not necessary to call this function directly\&.
\fBsd_bus_call\fR(3),
\fBsd_bus_call_async\fR(3)
and
\fBsd_bus_send\fR(3)
will seal any given messages if they have not been sealed yet\&.
.SH "RETURN VALUE"
.PP
On success, this function returns a non\-negative integer\&. On failure, it returns a negative errno\-style error code\&.
.SS "Errors"
.PP
Returned errors may indicate the following problems:
.PP
\fB\-EINVAL\fR
.RS 4
The
\fIm\fR
parameter is
\fBNULL\fR\&.
.sp
Added in version 246\&.
.RE
.PP
\fB\-EBADMSG\fR
.RS 4
The D\-Bus message
\fIm\fR
has open containers\&.
.sp
Added in version 246\&.
.RE
.PP
\fB\-ENOMSG\fR
.RS 4
The D\-Bus message
\fIm\fR
is a reply but its type signature does not match the return type signature of its corresponding member in the object vtable\&.
.sp
Added in version 246\&.
.RE
.SH "NOTES"
.PP
Functions described here are available as a shared library, which can be compiled against and linked to with the
\fBlibsystemd\fR\ \&\fBpkg-config\fR(1)
file\&.
.PP
The code described here uses
\fBgetenv\fR(3), which is declared to be not multi\-thread\-safe\&. This means that the code calling the functions described here must not call
\fBsetenv\fR(3)
from a parallel thread\&. It is recommended to only do calls to
\fBsetenv()\fR
from an early phase of the program when no other threads have been started\&.
.SH "HISTORY"
.PP
\fBsd_bus_message_seal()\fR
was added in version 246\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1), \fBsd-bus\fR(3), \fBsd_bus_call\fR(3), \fBsd_bus_call_async\fR(3), \fBsd_bus_send\fR(3)
